HD74BC540A

HD74BC540A Octal Buffers/Line Drivers With 3 State Outputs ADE-205-031 (Z) Rev. 0 June 1993 Description The HD74BC540A provides high drivability and operation equal to or better than high speed bipolar standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5 of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight inverter drivers with three state outputs in a 20 pin package. When G1 and G2 is low level, this drivers set up output is enable. Features Input/Output are at high impedance state when power supply is off. Built in input pull up circuit can make input pins be open, when not used. Input is TTL level. Wide operating temperature range Ta = –40 to +85°C Function Table Inputs G1 L L H X H L X Z : : : : High level Low level Immaterial High impedance G2 L L X H A L H X X Output Y H L Z Z HD74BC540A Pin Arrangement G1 A1 A2 A3 A4 A5 A6 A7 A8 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC G2 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 (Top view) Absolute Maximum Ratings Item Supply voltage Input diode current Input voltage Output voltage Off state output voltage Storage temperature Note: Symbol VCC I IK VIN VOUT VOUT(off) Tstg Rating –0.5 to +7.0 ±30 –0.5 to +7.5 –0.5 to +7.5 –0.5 to +5.5 –65 to +150 Unit V mA V V V °C 1. The absolute maximum ratings are values which must not individually be exceeded, and furthermore, no two of which may be realized at the same time. 2 HD74BC540A Recommende...